Commit e1ce69df authored by Huw Davies's avatar Huw Davies Committed by Paul Moore

netlabel: Add support for enumerating the CALIPSO DOI list.

Enumerate the DOI list through the NLBL_CALIPSO_C_LISTALL command.
It takes no attributes.
Signed-off-by: default avatarHuw Davies <huw@codeweavers.com>
Signed-off-by: default avatarPaul Moore <paul@paul-moore.com>
parent a5e34490
......@@ -225,6 +225,7 @@ struct netlbl_lsm_secattr {
* @doi_free: free a CALIPSO DOI
* @doi_getdef: returns a reference to a DOI
* @doi_putdef: releases a reference of a DOI
* @doi_walk: enumerate the DOI list
*
* Description:
* This structure is filled out by the CALIPSO engine and passed
......@@ -238,6 +239,9 @@ struct netlbl_calipso_ops {
void (*doi_free)(struct calipso_doi *doi_def);
struct calipso_doi *(*doi_getdef)(u32 doi);
void (*doi_putdef)(struct calipso_doi *doi_def);
int (*doi_walk)(u32 *skip_cnt,
int (*callback)(struct calipso_doi *doi_def, void *arg),
void *cb_arg);
};
/*
......
......@@ -210,11 +210,52 @@ static void calipso_doi_putdef(struct calipso_doi *doi_def)
call_rcu(&doi_def->rcu, calipso_doi_free_rcu);
}
/**
* calipso_doi_walk - Iterate through the DOI definitions
* @skip_cnt: skip past this number of DOI definitions, updated
* @callback: callback for each DOI definition
* @cb_arg: argument for the callback function
*
* Description:
* Iterate over the DOI definition list, skipping the first @skip_cnt entries.
* For each entry call @callback, if @callback returns a negative value stop
* 'walking' through the list and return. Updates the value in @skip_cnt upon
* return. Returns zero on success, negative values on failure.
*
*/
static int calipso_doi_walk(u32 *skip_cnt,
int (*callback)(struct calipso_doi *doi_def,
void *arg),
void *cb_arg)
{
int ret_val = -ENOENT;
u32 doi_cnt = 0;
struct calipso_doi *iter_doi;
rcu_read_lock();
list_for_each_entry_rcu(iter_doi, &calipso_doi_list, list)
if (atomic_read(&iter_doi->refcount) > 0) {
if (doi_cnt++ < *skip_cnt)
continue;
ret_val = callback(iter_doi, cb_arg);
if (ret_val < 0) {
doi_cnt--;
goto doi_walk_return;
}
}
doi_walk_return:
rcu_read_unlock();
*skip_cnt = doi_cnt;
return ret_val;
}
static const struct netlbl_calipso_ops ops = {
.doi_add = calipso_doi_add,
.doi_free = calipso_doi_free,
.doi_getdef = calipso_doi_getdef,
.doi_putdef = calipso_doi_putdef,
.doi_walk = calipso_doi_walk,
};
/**
......
......@@ -46,6 +46,13 @@
#include "netlabel_mgmt.h"
#include "netlabel_domainhash.h"
/* Argument struct for calipso_doi_walk() */
struct netlbl_calipso_doiwalk_arg {
struct netlink_callback *nl_cb;
struct sk_buff *skb;
u32 seq;
};
/* NetLabel Generic NETLINK CALIPSO family */
static struct genl_family netlbl_calipso_gnl_family = {
.id = GENL_ID_GENERATE,
......@@ -183,6 +190,73 @@ static int netlbl_calipso_list(struct sk_buff *skb, struct genl_info *info)
return ret_val;
}
/**
* netlbl_calipso_listall_cb - calipso_doi_walk() callback for LISTALL
* @doi_def: the CALIPSO DOI definition
* @arg: the netlbl_calipso_doiwalk_arg structure
*
* Description:
* This function is designed to be used as a callback to the
* calipso_doi_walk() function for use in generating a response for a LISTALL
* message. Returns the size of the message on success, negative values on
* failure.
*
*/
static int netlbl_calipso_listall_cb(struct calipso_doi *doi_def, void *arg)
{
int ret_val = -ENOMEM;
struct netlbl_calipso_doiwalk_arg *cb_arg = arg;
void *data;
data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
cb_arg->seq, &netlbl_calipso_gnl_family,
NLM_F_MULTI, NLBL_CALIPSO_C_LISTALL);
if (!data)
goto listall_cb_failure;
ret_val = nla_put_u32(cb_arg->skb, NLBL_CALIPSO_A_DOI, doi_def->doi);
if (ret_val != 0)
goto listall_cb_failure;
ret_val = nla_put_u32(cb_arg->skb,
NLBL_CALIPSO_A_MTYPE,
doi_def->type);
if (ret_val != 0)
goto listall_cb_failure;
genlmsg_end(cb_arg->skb, data);
return 0;
listall_cb_failure:
genlmsg_cancel(cb_arg->skb, data);
return ret_val;
}
/**
* netlbl_calipso_listall - Handle a LISTALL message
* @skb: the NETLINK buffer
* @cb: the NETLINK callback
*
* Description:
* Process a user generated LISTALL message and respond accordingly. Returns
* zero on success and negative values on error.
*
*/
static int netlbl_calipso_listall(struct sk_buff *skb,
struct netlink_callback *cb)
{
struct netlbl_calipso_doiwalk_arg cb_arg;
u32 doi_skip = cb->args[0];
cb_arg.nl_cb = cb;
cb_arg.skb = skb;
cb_arg.seq = cb->nlh->nlmsg_seq;
calipso_doi_walk(&doi_skip, netlbl_calipso_listall_cb, &cb_arg);
cb->args[0] = doi_skip;
return skb->len;
}
/* NetLabel Generic NETLINK Command Definitions
*/
......@@ -201,6 +275,13 @@ static const struct genl_ops netlbl_calipso_ops[] = {
.doit = netlbl_calipso_list,
.dumpit = NULL,
},
{
.cmd = NLBL_CALIPSO_C_LISTALL,
.flags = 0,
.policy = calipso_genl_policy,
.doit = NULL,
.dumpit = netlbl_calipso_listall,
},
};
/* NetLabel Generic NETLINK Protocol Functions
......@@ -316,3 +397,28 @@ void calipso_doi_putdef(struct calipso_doi *doi_def)
if (ops)
ops->doi_putdef(doi_def);
}
/**
* calipso_doi_walk - Iterate through the DOI definitions
* @skip_cnt: skip past this number of DOI definitions, updated
* @callback: callback for each DOI definition
* @cb_arg: argument for the callback function
*
* Description:
* Iterate over the DOI definition list, skipping the first @skip_cnt entries.
* For each entry call @callback, if @callback returns a negative value stop
* 'walking' through the list and return. Updates the value in @skip_cnt upon
* return. Returns zero on success, negative values on failure.
*
*/
int calipso_doi_walk(u32 *skip_cnt,
int (*callback)(struct calipso_doi *doi_def, void *arg),
void *cb_arg)
{
int ret_val = -ENOMSG;
const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
if (ops)
ret_val = ops->doi_walk(skip_cnt, callback, cb_arg);
return ret_val;
}
......@@ -63,6 +63,17 @@
*
* If using CALIPSO_MAP_PASS no additional attributes are required.
*
* o LISTALL:
* This message is sent by an application to list the valid DOIs on the
* system. When sent by an application there is no payload and the
* NLM_F_DUMP flag should be set. The kernel should respond with a series of
* the following messages.
*
* Required attributes:
*
* NLBL_CALIPSO_A_DOI
* NLBL_CALIPSO_A_MTYPE
*
*/
/* NetLabel CALIPSO commands */
......@@ -105,5 +116,8 @@ int calipso_doi_add(struct calipso_doi *doi_def,
void calipso_doi_free(struct calipso_doi *doi_def);
struct calipso_doi *calipso_doi_getdef(u32 doi);
void calipso_doi_putdef(struct calipso_doi *doi_def);
int calipso_doi_walk(u32 *skip_cnt,
int (*callback)(struct calipso_doi *doi_def, void *arg),
void *cb_arg);
#endif
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment